feat: add location_slots to job_reservations for full slot persistence and update version to 0.9.1

Fix: modems do not show as "missing" any more, cleans up the dashboard.

backend/routers/fleet_calendar.py

@@ -212,6 +212,7 @@ async def create_reservation(
     if estimated_end_date and estimated_end_date < start_date:
         raise HTTPException(status_code=400, detail="Estimated end date must be after start date")
 
+    import json as _json
     reservation = JobReservation(
         id=str(uuid.uuid4()),
         name=data["name"],
@@ -224,6 +225,7 @@ async def create_reservation(
         device_type=data.get("device_type", "seismograph"),
         quantity_needed=data.get("quantity_needed"),
         estimated_units=data.get("estimated_units"),
+        location_slots=_json.dumps(data["location_slots"]) if data.get("location_slots") is not None else None,
         notes=data.get("notes"),
         color=data.get("color", "#3B82F6")
     )
@@ -275,6 +277,9 @@ async def get_reservation(
     # Build per-unit lookups from assignments
     assignment_map = {a.unit_id: a for a in assignments_sorted}
 
+    import json as _json
+    stored_slots = _json.loads(reservation.location_slots) if reservation.location_slots else None
+
     return {
         "id": reservation.id,
         "name": reservation.name,
@@ -287,6 +292,7 @@ async def get_reservation(
         "device_type": reservation.device_type,
         "quantity_needed": reservation.quantity_needed,
         "estimated_units": reservation.estimated_units,
+        "location_slots": stored_slots,
         "notes": reservation.notes,
         "color": reservation.color,
         "assigned_units": [
@@ -336,6 +342,9 @@ async def update_reservation(
         reservation.quantity_needed = data["quantity_needed"]
     if "estimated_units" in data:
         reservation.estimated_units = data["estimated_units"]
+    if "location_slots" in data:
+        import json as _json
+        reservation.location_slots = _json.dumps(data["location_slots"]) if data["location_slots"] is not None else None
     if "notes" in data:
         reservation.notes = data["notes"]
     if "color" in data: